Becky, there are several different Osmocote products, are you using one with micronutrients? Just curious, why use so many different things?
It's not possible to know what nutrient balance you naturally have in your top soil plus pine fines without testing. Soils can vary. I'm assuming the mix contains enough calcium naturally because that isn't in fertilizers generally (nor is magnesium but you're adding that with the Epsom salts).
